
\bigbreak
\centerline{\bf References}
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{

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Hoerl, A. E. and R. W. Kennard, 1970. Ridge regression: biased
estimation for non-orthogonal problems and applications.
Technometrics, 12: 55-69.

Touretzky, David S. and Dean A. Pomerlau, 1989. 
What's in the hidden layers? Byte 14(8): 227-233

Griewank, A. and G. F. Corliss ({\it eds.}), 1991. Automatic differentiation 
   of algorithms: theory, implementation and application.
   Philadelphia, PA: SIAM.

Hasselblad, V. 1966. Estimation of Parameters for a mixture of
normal distributions. Technometrics 8: 431-444. \par
}
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